my personal opinion on nicotine addiction is this, nicotine it self is not much more addictive than caffeine however when they add in all the chemicals in to cigs and other mainstream tobacco products that is what causes the excessive addiction.
not quite. My lab team and I at school conducted an analysis (a test to see how good you were at detecting trace compounds) and we obtained a list of all the chemicals contained in a cigarette (and wrapping paper). suprisingly few of them were habit forming, certainly none are as potent or prevalent as nicotine
myself, I don't smoke hookah often enough to get addicted (at least I tell myself that.) A few short sessions a week is the max I do.